I've never liked the idea of them doing nearly nothing and being stuck in a 5000 years long 'shock'. It's just too unlikely to me. All of them would have died within years if they were really that catatonic.
I understand what you're saying, but I would also think that High Ones have pretty long memories, and you have to have enough time pass for Timmain to actually forget she was a High One. I would give that a couple of thousand years at least.
And during that time I don't think they were just sitting around waiting for another ship to pick them up. In the novels Zarhan says he's the third generation born on the world of two moons, so they were learning how to provide for themselves, finding a place away from humans, and having kids.